The document makes reference to a 2008 op-ed in The New York Times that was written by Republican nominee Mitt Romney with the headline "Let Detroit Go Bankrupt."

Democrats have seized on that op-ed, claiming that Romney would have let the auto industry go bankrupt.

"Mitt Romney thought the government’s action would destroy the auto industry; he and Republican leaders opposed the support President Obama extended to rescue an iconic industry," says the Dem platform.

Romney has argued he was suggesting that the auto companies be placed into a "managed bankruptcy."

The Democratic platform also touts new higher gas mileage rules for cars implemented earlier this month by the Obama administration. Under the new rules, cars will have to get at least 54.5 miles per gallon by the year 2025.

The rules will "save a typical car owner more than $8,000 in fuel costs over the life of their vehicle and reduce American consumers’ fuel costs by almost $2 trillion," the Democratic platform says.

"The Democratic Party supports a broad-based strategy to further strengthen an American renaissance in manufacturing, with tax relief for clean energy manufacturing, incentives to create advanced vehicles in the United States, more research, and a network of manufacturing innovation hubs," the platform continues.

The Democratic platform also calls for "long- term investments in our infrastructure."

"Roads, bridges, rail and public transit systems, airports, ports, and sewers are all critical to economic growth, as they enable businesses to grow," the platform says.

The platform gives no credit to Republicans in Congress for the highway bill, however.

"That’s why President Obama and Democrats in Congress have enacted infrastructure investments that will sustain our Highway Trust Fund and provide states, U.S. territories, and communities with two years of funding to build needed infrastructure," it says.

The platform says the investments in the current two-year highway bill "are critical for putting Americans back to work and strengthening America’s transportation system to grow our economy."

But it adds: "The president has proposed to go substantially further, including a significant up-front investment in our infrastructure followed by sustained increases in investment paid for with part of the savings from winding down our overseas wars, together with reforms that will better leverage government dollars and target significant projects."